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        <li class="header">Part I</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2" data-path="../C++必知必会的知识点/">
            
                <a href="../C++必知必会的知识点/">
            
                    
                    C++必知必会的知识点
            
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        <li class="chapter " data-level="1.2.1" data-path="../C++必知必会的知识点/如何成为一名合格的CC++开发者？.html">
            
                <a href="../C++必知必会的知识点/如何成为一名合格的CC++开发者？.html">
            
                    
                    如何成为一名合格的C/C++开发者？
            
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        </li>
    
        <li class="chapter " data-level="1.2.2" data-path="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                <a href="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                    
                    不定参数函数实现var_arg系列的宏
            
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        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                <a href="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                    
                    你一定要搞明白的C函数调用方式与栈原理
            
                </a>
            

            
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        <li class="chapter " data-level="1.2.4" data-path="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
                <a href="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
                    
                    深入理解C/C++中的指针
            
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        <li class="chapter " data-level="1.2.5" data-path="../C++必知必会的知识点/详解C++11中的智能指针.html">
            
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                    详解C++11中的智能指针
            
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                    C++17结构化绑定
            
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                    C++必须掌握的pimpl惯用法
            
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                <a href="../C++必知必会的知识点/用VisualStudio调试Linux程序.html">
            
                    
                    用Visual Studio调试Linux程序
            
                </a>
            

            
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        <li class="chapter " data-level="1.2.9" data-path="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                <a href="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                    
                    如何使用Visual Studio管理和阅读开源项目代码
            
                </a>
            

            
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        <li class="chapter " data-level="1.2.10" data-path="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                <a href="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                    
                    利用cmake工具生成Visual Studio工程文件
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.3" data-path="../多线程/">
            
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                    多线程
            
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        <li class="chapter " data-level="1.3.1" data-path="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                <a href="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                    
                    后台C++开发你一定要知道的条件变量
            
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        <li class="chapter " data-level="1.3.2" data-path="../多线程/整型变量赋值是原子操作吗？.html">
            
                <a href="../多线程/整型变量赋值是原子操作吗？.html">
            
                    
                    整型变量赋值是原子操作吗？
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../网络编程/">
            
                <a href="../网络编程/">
            
                    
                    网络编程
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" data-path="../网络编程/bind函数重难点解析.html">
            
                <a href="../网络编程/bind函数重难点解析.html">
            
                    
                    bind 函数重难点解析
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.2" data-path="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                <a href="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                    
                    connect 函数在阻塞和非阻塞模式下的行为
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3" data-path="../网络编程/select函数重难点解析.html">
            
                <a href="../网络编程/select函数重难点解析.html">
            
                    
                    select 函数重难点解析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4" data-path="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                <a href="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                    
                    Linux epoll 模型（含LT 模式和 ET 模式详解）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5" data-path="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                <a href="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                    
                    socket 的阻塞模式和非阻塞模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                    
                    非阻塞模式下 send 和 recv 函数的返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
            
                <a href="../网络编程/服务器开发通信协议设计介绍.html">
            
                    
                    服务器开发通信协议设计介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                    
                    TCP 协议如何解决粘包、半包问题
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
            
                <a href="../网络编程/网络通信中收发数据的正确姿势.html">
            
                    
                    网络通信中收发数据的正确姿势
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                    
                    服务器端发数据时，如果对端一直不收，怎么办？
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
            
                <a href="../程序员必知必会的网络命令/">
            
                    
                    程序员必知必会的网络命令
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                    
                    利用telnet命令发电子邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                    
                    做Java或者C++开发都应该知道的lsof命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                    
                    Linux网络故障排查的瑞士军刀nc命令
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                    
                    Linux tcpdump使用详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                    
                    从抓包的角度分析connect函数的连接过程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                    
                    服务器开发中网络数据分析与故障排查经验漫谈
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part II</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
            
                <a href="../高性能服务器框架设计/">
            
                    
                    高性能服务器框架设计
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                    
                    主线程与工作线程的分工
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
            
                <a href="../高性能服务器框架设计/Reactor模式.html">
            
                    
                    Reactor模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                    
                    实例：一个服务器程序的架构介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
            
                <a href="../高性能服务器框架设计/错误码系统的设计.html">
            
                    
                    错误码系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
            
                <a href="../高性能服务器框架设计/日志系统的设计.html">
            
                    
                    日志系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                    
                    如何设计断线自动重连机制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                    
                    心跳包机制设计详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                    
                    业务数据处理一定要单独开线程吗
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                    
                    C++ 高性能服务器网络框架设计细节
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
            
                <a href="../服务器开发案例实战/">
            
                    
                    服务器开发案例实战
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
            
                <a href="../服务器开发案例实战/从零实现一个http服务器.html">
            
                    
                    从零实现一个http服务器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                    
                    从零实现一款12306刷票软件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                    
                    从零实现一个邮件收发客户端
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                    
                    从零开发一个WebSocket服务器
            
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        <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                    
                    从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
            
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        <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
            
                <a href="../服务器开发案例实战/2最后一战概况.html">
            
                    
                    从零学习开源项目系列（二） 最后一战概况
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                    
                    从零学习开源项目系列（三） CSBattleMgr服务源码研究
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
            
                <a href="../服务器开发案例实战/4LogServer源码探究.html">
            
                    
                    从零学习开源项目系列（四）LogServer源码探究
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part III</li>
        
        
    
        <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
            
                <a href="../TeamTalk源码解析/">
            
                    
                    TeamTalk IM源码分析
            
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        <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
            
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                    01 TeamTalk介绍
            
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        <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                    
                    02 服务器端的程序的编译与部署
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
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                    03 服务器端的程序架构介绍
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
            
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                    04 服务器端db_proxy_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
            
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                    05 服务器端msg_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
            
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                    06 服务器端login_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
            
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                    07 服务器端msfs源码分析
            
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        <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
            
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                    08 服务器端file_server源码分析
            
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        <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
            
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                    09 服务器端route_server源码分析
            
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        <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                    
                    10 开放一个TeamTalk测试服务器地址和几个测试账号
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                    
                    11 pc客户端源码分析
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
            
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                    libevent源码深度剖析
            
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                    libevent源码深度剖析01
            
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        <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
            
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                    libevent源码深度剖析02
            
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        <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
            
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                    libevent源码深度剖析03
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
            
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                    libevent源码深度剖析04
            
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        <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
            
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                    libevent源码深度剖析05
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
            
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                    libevent源码深度剖析06
            
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        <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
            
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                    libevent源码深度剖析07
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
            
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                    libevent源码深度剖析08
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
            
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                    libevent源码深度剖析09
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
            
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                    libevent源码深度剖析10
            
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        <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
            
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                    libevent源码深度剖析11
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                <a href="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                    
                    libevent源码深度剖析12
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
            
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                    libevent源码深度剖析13
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="./">
            
                <a href="./">
            
                    
                    leveldb源码分析
            
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        <li class="chapter " data-level="7.2.1" data-path="leveldb源码分析1.html">
            
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                    leveldb源码分析1
            
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        <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
            
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                    leveldb源码分析2
            
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        <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
            
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                    leveldb源码分析3
            
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        <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
            
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                    leveldb源码分析4
            
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        <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
            
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                    leveldb源码分析5
            
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        </li>
    
        <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
            
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                    leveldb源码分析6
            
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        <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
            
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                    leveldb源码分析7
            
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        <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
            
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                    leveldb源码分析8
            
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        </li>
    
        <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
            
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                    leveldb源码分析9
            
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        </li>
    
        <li class="chapter active" data-level="7.2.10" data-path="leveldb源码分析10.html">
            
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                    leveldb源码分析10
            
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        <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
            
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                    leveldb源码分析11
            
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        <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
            
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                    leveldb源码分析12
            
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        <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
            
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                    leveldb源码分析13
            
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        <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
            
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                    leveldb源码分析14
            
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        <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
            
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                    leveldb源码分析15
            
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        <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
            
                <a href="leveldb源码分析16.html">
            
                    
                    leveldb源码分析16
            
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        <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
            
                <a href="leveldb源码分析17.html">
            
                    
                    leveldb源码分析17
            
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        <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
            
                <a href="leveldb源码分析18.html">
            
                    
                    leveldb源码分析18
            
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        <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
            
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                    leveldb源码分析19
            
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        <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
            
                <a href="leveldb源码分析20.html">
            
                    
                    leveldb源码分析20
            
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        <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
            
                <a href="leveldb源码分析21.html">
            
                    
                    leveldb源码分析21
            
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        <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
            
                <a href="leveldb源码分析22.html">
            
                    
                    leveldb源码分析22
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
            
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                    Memcached源码分析
            
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        <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
            
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                    00 服务器资源调整
            
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        <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
            
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                    01 初始化参数解析
            
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        <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
            
                <a href="../Memcached源码分析/02网络监听的建立.html">
            
                    
                    02 网络监听的建立
            
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        <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
            
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                    03 网络连接建立
            
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        <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
            
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                    04 内存初始化
            
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        <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
            
                <a href="../Memcached源码分析/05资源初始化.html">
            
                    
                    05 资源初始化
            
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        <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
            
                <a href="../Memcached源码分析/06get过程.html">
            
                    
                    06 get过程
            
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        <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
            
                <a href="../Memcached源码分析/07cas属性.html">
            
                    
                    07 cas属性
            
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        <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
            
                <a href="../Memcached源码分析/08内存池.html">
            
                    
                    08 内存池
            
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        <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
            
                <a href="../Memcached源码分析/09连接队列.html">
            
                    
                    09 连接队列
            
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        <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
            
                <a href="../Memcached源码分析/10Hash表操作.html">
            
                    
                    10 Hash表操作
            
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        <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
            
                <a href="../Memcached源码分析/12set操作.html">
            
                    
                    12 set操作
            
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        <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
            
                <a href="../Memcached源码分析/13do_item_alloc操作.html">
            
                    
                    13 do_item_alloc操作
            
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        <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
            
                <a href="../Memcached源码分析/14item结构.html">
            
                    
                    14 item结构
            
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        <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
            
                <a href="../Memcached源码分析/15Hash表扩容.html">
            
                    
                    15 Hash表扩容
            
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        <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
            
                <a href="../Memcached源码分析/16线程交互.html">
            
                    
                    16 线程交互
            
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        <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
            
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                    17 状态机
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
            
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                    游戏开发专题
            
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                    1 游戏服务器开发的基本体系与服务器端开发的一些建议
            
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        <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
            
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                    2 网络游戏服务器开发框架设计介绍
            
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        <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
            
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                    3 游戏后端开发需要掌握的知识
            
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        <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
            
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                    4 关于游戏服务端架构的整理
            
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        <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
            
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                    5 各类游戏对应的服务端架构
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
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                    6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
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                    7 QQ游戏百万人同时在线服务器架构实现
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
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                    8 大型多人在线游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
            
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                    9 百万用户级游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
            
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                    10 十万在线的WebGame的数据库设计思路
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
            
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                    11 一种高性能网络游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.12" data-path="../游戏开发专题/12经典游戏服务器端架构概述.html">
            
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                    12 经典游戏服务器端架构概述
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.13" data-path="../游戏开发专题/13游戏跨服架构进化之路.html">
            
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                    13 游戏跨服架构进化之路
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
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                    腾讯后台开发实习生技能要求
            
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                    聊聊如何拿大厂的 offer
            
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            </ul>
            
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        <li class="chapter " data-level="10.2" data-path="../职业规划/">
            
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                    职业规划
            
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        <li class="chapter " data-level="10.2.1" data-path="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
            
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        <li class="chapter " data-level="10.2.2" data-path="../职业规划/聊聊技术人员的常见的职业问题.html">
            
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                    聊聊技术人员的常见的职业问题
            
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        <li class="chapter " data-level="10.2.3" data-path="../职业规划/写给那些傻傻想做服务器开发的朋友.html">
            
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                    写给那些傻傻想做服务器开发的朋友
            
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        <li class="chapter " data-level="10.3" data-path="../自我提升与开源代码/">
            
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                    自我提升与开源代码
            
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                    2020 年好好读一读开源代码吧
            
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        <li class="chapter " data-level="10.4" data-path="../后端开发相关的书籍/">
            
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                    后端开发相关的书籍
            
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        <li class="chapter " data-level="10.4.1" data-path="../后端开发相关的书籍/后台开发应该读的书.html">
            
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                    程序员的简历
            
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                </a>
            

            
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                    程序员的薪资与年终奖那些事儿
            
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        <li class="chapter " data-level="10.6.1" data-path="../程序员的薪资与年终奖那些事儿/技术面试与HR谈薪资技巧.html">
            
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                    我的 2019
            
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<h2 id="6sstable&#x4E4B;&#x56DB;"><a name="6sstable&#x4E4B;&#x56DB;" class="anchor-navigation-ex-anchor" href="#6sstable&#x4E4B;&#x56DB;"><i class="fa fa-link" aria-hidden="true"></i></a>6.SSTable&#x4E4B;&#x56DB;</h2>
<h3 id="66-&#x904D;&#x5386;table"><a name="66-&#x904D;&#x5386;table" class="anchor-navigation-ex-anchor" href="#66-&#x904D;&#x5386;table"><i class="fa fa-link" aria-hidden="true"></i></a>6.6 &#x904D;&#x5386;Table</h3>
<h4 id="661-&#x904D;&#x5386;&#x63A5;&#x53E3;"><a name="661-&#x904D;&#x5386;&#x63A5;&#x53E3;" class="anchor-navigation-ex-anchor" href="#661-&#x904D;&#x5386;&#x63A5;&#x53E3;"><i class="fa fa-link" aria-hidden="true"></i></a>6.6.1 &#x904D;&#x5386;&#x63A5;&#x53E3;</h4>
<p>Table&#x5BFC;&#x51FA;&#x4E86;&#x4E00;&#x4E2A;&#x8FD4;&#x56DE;<strong>Iterator</strong>&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x901A;&#x8FC7;Iterator&#x5BF9;&#x8C61;&#xFF0C;&#x8C03;&#x7528;&#x8005;&#x5C31;&#x53EF;&#x4EE5;<strong>&#x904D;&#x5386;</strong>Table&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x5B83;&#x7B80;&#x5355;&#x7684;&#x8FD4;&#x56DE;&#x4E86;&#x4E00;&#x4E2A;<strong>TwoLevelIterator</strong>&#x5BF9;&#x8C61;&#x3002;&#x89C1;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#xFF1A;</p>
<pre class="language-"><code>Iterator* NewIterator(const ReadOptions&amp;options) const;  
{  
     return NewTwoLevelIterator(rep_-&gt;index_block-&gt;NewIterator(rep_-&gt;options.comparator),  
                                &amp;Table::BlockReader,const_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Table*</span><span class="token punctuation">&gt;</span></span>(this), options);  
}  
// &#x51FD;&#x6570;NewTwoLevelIterator&#x521B;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A;TwoLevelIterator&#x5BF9;&#x8C61;&#xFF1A;  
Iterator* NewTwoLevelIterator(Iterator* index_iter,BlockFunction block_function,  
                              void* arg, constReadOptions&amp; options) 
{  
     return newTwoLevelIterator(index_iter, block_function, arg, options);  
}
</code></pre><p>&#x8FD9;&#x91CC;&#x6709;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x6307;&#x9488;BlockFunction&#xFF0C;&#x7C7B;&#x578B;&#x4E3A;&#xFF1A;</p>
<pre class="language-"><code>typedef Iterator* (*BlockFunction)(void*, const ReadOptions&amp;, constSlice&amp;);
</code></pre><p><strong>&#x4E3A;&#x4EC0;&#x4E48;&#x53EB;TwoLevelIterator&#x5462;</strong>&#xFF0C;&#x4E0B;&#x9762;&#x5C31;&#x6765;&#x770B;&#x770B;&#x3002;</p>
<h4 id="662-twoleveliterator"><a name="662-twoleveliterator" class="anchor-navigation-ex-anchor" href="#662-twoleveliterator"><i class="fa fa-link" aria-hidden="true"></i></a>6.6.2 TwoLevelIterator</h4>
<p>&#x5B83;&#x4E5F;&#x662F;<strong>Iterator&#x7684;&#x5B50;&#x7C7B;</strong>&#xFF0C;&#x4E4B;&#x6240;&#x4EE5;&#x53EB;two level&#x5E94;&#x8BE5;&#x662F;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x8FED;&#x4EE3;&#x5176;&#x4E2D;&#x5B58;&#x50A8;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x8FD8;&#x63A5;&#x53D7;&#x4E86;&#x4E00;&#x4E2A;&#x51FD;&#x6570;<strong>BlockFunction</strong>&#xFF0C;&#x53EF;&#x4EE5;&#x904D;&#x5386;&#x5B58;&#x50A8;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x53EF;&#x89C1;&#x5B83;&#x662F;&#x4E13;&#x95E8;&#x4E3A;<strong>Table&#x5B9A;&#x5236;</strong>&#x7684;&#x3002;
&#x6211;&#x4EEC;&#x5DF2;&#x7ECF;&#x77E5;&#x9053;&#x5404;&#x79CD;Block&#x7684;<strong>&#x5B58;&#x50A8;&#x683C;&#x5F0F;</strong>&#x90FD;&#x662F;<strong>&#x76F8;&#x540C;</strong>&#x7684;&#xFF0C;&#x4F46;&#x662F;&#x5404;&#x81EA;block data&#x5B58;&#x50A8;&#x7684;<strong>k/v</strong>&#x53C8;<strong>&#x4E92;&#x4E0D;&#x76F8;&#x540C;</strong>&#xFF0C;&#x4E8E;&#x662F;&#x6211;&#x4EEC;&#x5C31;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x9014;&#x5F84;&#xFF0C;&#x80FD;&#x591F;&#x5728;&#x4F7F;&#x7528;&#x540C;&#x4E00;&#x4E2A;&#x65B9;&#x5F0F;<strong>&#x904D;&#x5386;</strong>&#x4E0D;&#x540C;&#x7684;block&#x65F6;&#xFF0C;&#x53C8;&#x80FD;<strong>&#x89E3;&#x6790;</strong>&#x8FD9;&#x4E9B;k/v&#x3002;&#x8FD9;&#x5C31;&#x662F;<strong>BlockFunction</strong>&#xFF0C;&#x5B83;&#x53C8;&#x8FD4;&#x56DE;&#x4E86;&#x4E00;&#x4E2A;&#x9488;&#x5BF9;block data&#x7684;Iterator&#x3002;<strong>Block&#x548C;block data</strong>&#x5B58;&#x50A8;&#x7684;k/v&#x5BF9;&#x7684;key&#x662F;&#x7EDF;&#x4E00;&#x7684;&#x3002;
&#x5148;&#x6765;&#x770B;&#x7C7B;&#x7684;&#x4E3B;&#x8981;&#x6210;&#x5458;&#x53D8;&#x91CF;&#xFF1A;</p>
<pre class="language-"><code>BlockFunction block_function_; // block&#x64CD;&#x4F5C;&#x51FD;&#x6570;  
void* arg_;                    // BlockFunction&#x7684;&#x81EA;&#x5B9A;&#x4E49;&#x53C2;&#x6570;  
const ReadOptions options_;    // BlockFunction&#x7684;read option&#x53C2;&#x6570;  
Status status_;                // &#x5F53;&#x524D;&#x72B6;&#x6001;  
IteratorWrapper index_iter_;   // &#x904D;&#x5386;block&#x7684;&#x8FED;&#x4EE3;&#x5668;  
IteratorWrapper data_iter_;    // May be NULL-&#x904D;&#x5386;block data&#x7684;&#x8FED;&#x4EE3;&#x5668;  
// &#x5982;&#x679C;data_iter_ != NULL&#xFF0C;data_block_handle_&#x4FDD;&#x5B58;&#x7684;&#x662F;&#x4F20;&#x9012;&#x7ED9;  
// block_function_&#x7684;index value&#xFF0C;&#x4EE5;&#x7528;&#x6765;&#x521B;&#x5EFA;data_iter_  
std::string data_block_handle_;
</code></pre><p>&#x4E0B;&#x9762;<strong>&#x5206;&#x6790;&#x4E00;&#x4E0B;&#x5BF9;&#x4E8E;Iterator&#x51E0;&#x4E2A;&#x63A5;&#x53E3;&#x7684;&#x5B9E;&#x73B0;&#x3002;</strong></p>
<h5 id="s1-&#x5BF9;&#x4E8E;&#x5176;key&#x548C;value&#x63A5;&#x53E3;&#x90FD;&#x662F;&#x8FD4;&#x56DE;&#x7684;dataiter&#x5BF9;&#x5E94;&#x7684;key&#x548C;value&#xFF1A;"><a name="s1-&#x5BF9;&#x4E8E;&#x5176;key&#x548C;value&#x63A5;&#x53E3;&#x90FD;&#x662F;&#x8FD4;&#x56DE;&#x7684;dataiter&#x5BF9;&#x5E94;&#x7684;key&#x548C;value&#xFF1A;" class="anchor-navigation-ex-anchor" href="#s1-&#x5BF9;&#x4E8E;&#x5176;key&#x548C;value&#x63A5;&#x53E3;&#x90FD;&#x662F;&#x8FD4;&#x56DE;&#x7684;dataiter&#x5BF9;&#x5E94;&#x7684;key&#x548C;value&#xFF1A;"><i class="fa fa-link" aria-hidden="true"></i></a>S1 &#x5BF9;&#x4E8E;&#x5176;Key&#x548C;Value&#x63A5;&#x53E3;&#x90FD;&#x662F;&#x8FD4;&#x56DE;&#x7684;data<em>iter</em>&#x5BF9;&#x5E94;&#x7684;key&#x548C;value&#xFF1A;</h5>
<pre class="language-"><code>virtual bool Valid() const 
{  
      return data_iter_.Valid();  
} 

virtual Slice key() const 
{   
       assert(Valid());  
       return data_iter_.key();  
}

virtual Slice value() const 
{  
       assert(Valid());  
       return data_iter_.value();  
}
</code></pre><p><strong>S2 &#x5728;&#x5206;&#x6790;Seek&#x7CFB;&#x51FD;&#x6570;&#x4E4B;&#x524D;</strong>&#xFF0C;&#x6709;&#x5FC5;&#x8981;&#x5148;&#x4E86;&#x89E3;&#x4E0B;&#x9762;&#x8FD9;&#x51E0;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x7528;&#x9014;&#x3002;</p>
<pre class="language-"><code>void InitDataBlock();  
void SetDataIterator(Iterator*data_iter); 
//&#x8BBE;&#x7F6E;date_iter_ = data_iter  
voidSkipEmptyDataBlocksForward();  
voidSkipEmptyDataBlocksBackward();
</code></pre><h6 id="s21&#x9996;&#x5148;&#x662F;initdatablock&#xFF0C;&#x5B83;&#x662F;&#x6839;&#x636E;indexiter&#x6765;&#x521D;&#x59CB;&#x5316;dataiter&#xFF0C;&#x5F53;&#x5B9A;&#x4F4D;&#x5230;&#x65B0;&#x7684;block&#x65F6;&#xFF0C;&#x9700;&#x8981;&#x66F4;&#x65B0;data-iterator&#xFF0C;&#x6307;&#x5411;&#x8BE5;block&#x4E2D;kv&#x5BF9;&#x7684;&#x5408;&#x9002;&#x4F4D;&#x7F6E;&#xFF0C;&#x51FD;&#x6570;&#x5982;&#x4E0B;&#xFF1A;"><a name="s21&#x9996;&#x5148;&#x662F;initdatablock&#xFF0C;&#x5B83;&#x662F;&#x6839;&#x636E;indexiter&#x6765;&#x521D;&#x59CB;&#x5316;dataiter&#xFF0C;&#x5F53;&#x5B9A;&#x4F4D;&#x5230;&#x65B0;&#x7684;block&#x65F6;&#xFF0C;&#x9700;&#x8981;&#x66F4;&#x65B0;data-iterator&#xFF0C;&#x6307;&#x5411;&#x8BE5;block&#x4E2D;kv&#x5BF9;&#x7684;&#x5408;&#x9002;&#x4F4D;&#x7F6E;&#xFF0C;&#x51FD;&#x6570;&#x5982;&#x4E0B;&#xFF1A;" class="anchor-navigation-ex-anchor" href="#s21&#x9996;&#x5148;&#x662F;initdatablock&#xFF0C;&#x5B83;&#x662F;&#x6839;&#x636E;indexiter&#x6765;&#x521D;&#x59CB;&#x5316;dataiter&#xFF0C;&#x5F53;&#x5B9A;&#x4F4D;&#x5230;&#x65B0;&#x7684;block&#x65F6;&#xFF0C;&#x9700;&#x8981;&#x66F4;&#x65B0;data-iterator&#xFF0C;&#x6307;&#x5411;&#x8BE5;block&#x4E2D;kv&#x5BF9;&#x7684;&#x5408;&#x9002;&#x4F4D;&#x7F6E;&#xFF0C;&#x51FD;&#x6570;&#x5982;&#x4E0B;&#xFF1A;"><i class="fa fa-link" aria-hidden="true"></i></a>S2.1&#x9996;&#x5148;&#x662F;InitDataBlock()&#xFF0C;&#x5B83;&#x662F;&#x6839;&#x636E;index_iter&#x6765;&#x521D;&#x59CB;&#x5316;data_iter&#xFF0C;&#x5F53;&#x5B9A;&#x4F4D;&#x5230;&#x65B0;&#x7684;block&#x65F6;&#xFF0C;&#x9700;&#x8981;&#x66F4;&#x65B0;data Iterator&#xFF0C;&#x6307;&#x5411;&#x8BE5;block&#x4E2D;k/v&#x5BF9;&#x7684;&#x5408;&#x9002;&#x4F4D;&#x7F6E;&#xFF0C;&#x51FD;&#x6570;&#x5982;&#x4E0B;&#xFF1A;</h6>
<pre class="language-"><code>if (!index_iter_.Valid()) SetDataIterator(NULL);
// index_iter&#x975E;&#x6CD5;  
else 
{  
      Slice handle =index_iter_.value();  
      if (data_iter_.iter() != NULL&amp;&amp; handle.compare(data_block_handle_) == 0)
      {  
           //data_iter&#x5DF2;&#x7ECF;&#x5728;&#x8BE5;block data&#x4E0A;&#x4E86;&#xFF0C;&#x65E0;&#x987B;&#x6539;&#x53D8;  
         } 
      else 
      { 
           // &#x6839;&#x636E;handle&#x6570;&#x636E;&#x5B9A;&#x4F4D;data iter  
           Iterator* iter =(*block_function_)(arg_, options_, handle);  
           data_block_handle_.assign(handle.data(), handle.size());  
           SetDataIterator(iter);  
      }  
}
</code></pre><h6 id="s22-skipemptydatablocksforward&#xFF0C;&#x5411;&#x524D;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;"><a name="s22-skipemptydatablocksforward&#xFF0C;&#x5411;&#x524D;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;" class="anchor-navigation-ex-anchor" href="#s22-skipemptydatablocksforward&#xFF0C;&#x5411;&#x524D;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;"><i class="fa fa-link" aria-hidden="true"></i></a>S2.2 SkipEmptyDataBlocksForward&#xFF0C;&#x5411;&#x524D;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;</h6>
<pre class="language-"><code>while (data_iter_.iter() == NULL|| !data_iter_.Valid()) 
{   
      // &#x8DF3;&#x5230;&#x4E0B;&#x4E00;&#x4E2A;block  
      if (!index_iter_.Valid()) 
      { 
           // &#x5982;&#x679C;index iter&#x975E;&#x6CD5;&#xFF0C;&#x8BBE;&#x7F6E;data iteration&#x4E3A;NULL  
           SetDataIterator(NULL);  
           return;  
         }  
      index_iter_.Next();  
      InitDataBlock();  
      if (data_iter_.iter() != NULL)data_iter_.SeekToFirst();
      // &#x8DF3;&#x8F6C;&#x5230;&#x5F00;&#x59CB;  
}
</code></pre><h6 id="s23-skipemptydatablocksbackward&#xFF0C;&#x5411;&#x540E;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;"><a name="s23-skipemptydatablocksbackward&#xFF0C;&#x5411;&#x540E;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;" class="anchor-navigation-ex-anchor" href="#s23-skipemptydatablocksbackward&#xFF0C;&#x5411;&#x540E;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;"><i class="fa fa-link" aria-hidden="true"></i></a>S2.3 SkipEmptyDataBlocksBackward&#xFF0C;&#x5411;&#x540E;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;datablock&#xFF0C;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x5982;&#x4E0B;&#xFF1A;</h6>
<pre class="language-"><code>while (data_iter_.iter() == NULL|| !data_iter_.Valid()) 
{ 
     // &#x8DF3;&#x5230;&#x524D;&#x4E00;&#x4E2A;block  
     if (!index_iter_.Valid()) 
     { 
          // &#x5982;&#x679C;index iter&#x975E;&#x6CD5;&#xFF0C;&#x8BBE;&#x7F6E;data iteration&#x4E3A;NULL  
          SetDataIterator(NULL);  
          return;  
        }  
        index_iter_.Prev();  
      InitDataBlock();  
      if (data_iter_.iter() != NULL)data_iter_.SeekToLast();
      // &#x8DF3;&#x8F6C;&#x5230;&#x5F00;&#x59CB;  
}
</code></pre><h5 id="s3-&#x4E86;&#x89E3;&#x4E86;&#x51E0;&#x4E2A;&#x8DF3;&#x8F6C;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x518D;&#x6765;&#x770B;seek&#x7CFB;&#x63A5;&#x53E3;&#x3002;"><a name="s3-&#x4E86;&#x89E3;&#x4E86;&#x51E0;&#x4E2A;&#x8DF3;&#x8F6C;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x518D;&#x6765;&#x770B;seek&#x7CFB;&#x63A5;&#x53E3;&#x3002;" class="anchor-navigation-ex-anchor" href="#s3-&#x4E86;&#x89E3;&#x4E86;&#x51E0;&#x4E2A;&#x8DF3;&#x8F6C;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x518D;&#x6765;&#x770B;seek&#x7CFB;&#x63A5;&#x53E3;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S3 &#x4E86;&#x89E3;&#x4E86;&#x51E0;&#x4E2A;&#x8DF3;&#x8F6C;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x518D;&#x6765;&#x770B;Seek&#x7CFB;&#x63A5;&#x53E3;&#x3002;</h5>
<pre class="language-"><code>void TwoLevelIterator::Seek(const Slice&amp; target) 
{  
    index_iter_.Seek(target);  
    InitDataBlock(); 
    // &#x6839;&#x636E;index iter&#x8BBE;&#x7F6E;data iter  
    if (data_iter_.iter() != NULL)data_iter_.Seek(target); 
    // &#x8C03;&#x6574;data iter&#x8DF3;&#x8F6C;&#x5230;target  
    SkipEmptyDataBlocksForward(); 
    // &#x8C03;&#x6574;iter&#xFF0C;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;block  
}  

void TwoLevelIterator::SeekToFirst() 
{  
    index_iter_.SeekToFirst();  
    InitDataBlock();              // &#x6839;&#x636E;index iter&#x8BBE;&#x7F6E;data iter  
    if (data_iter_.iter() != NULL)data_iter_.SeekToFirst();  
    SkipEmptyDataBlocksForward(); // &#x8C03;&#x6574;iter&#xFF0C;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;block  
} 

void TwoLevelIterator::SeekToLast() 
{  
    index_iter_.SeekToLast();  
    InitDataBlock();              // &#x6839;&#x636E;index iter&#x8BBE;&#x7F6E;data iter  
    if (data_iter_.iter() != NULL)data_iter_.SeekToLast();  
    SkipEmptyDataBlocksBackward();// &#x8C03;&#x6574;iter&#xFF0C;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;block  
}

void TwoLevelIterator::Next() 
{  
     assert(Valid());  
     data_iter_.Next();  
     SkipEmptyDataBlocksForward(); // &#x8C03;&#x6574;iter&#xFF0C;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;block  
}  

void TwoLevelIterator::Prev()
{  
     assert(Valid());  
     data_iter_.Prev();  
     SkipEmptyDataBlocksBackward();// &#x8C03;&#x6574;iter&#xFF0C;&#x8DF3;&#x8FC7;&#x7A7A;&#x7684;block  
}
</code></pre><h4 id="663-blockreader"><a name="663-blockreader" class="anchor-navigation-ex-anchor" href="#663-blockreader"><i class="fa fa-link" aria-hidden="true"></i></a>6.6.3 BlockReader()</h4>
<p>&#x4E0A;&#x9762;<strong>&#x4F20;&#x9012;&#x7ED9;twolevel Iterator&#x7684;&#x51FD;&#x6570;&#x662F;Table::BlockReader&#x51FD;&#x6570;</strong>&#xFF0C;&#x58F0;&#x660E;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code>static Iterator* Table::BlockReader(void* arg, const ReadOptions&amp;options,
                                  constSlice&amp; index_value);
</code></pre><p>&#x5B83;&#x6839;&#x636E;&#x53C2;&#x6570;&#x6307;&#x660E;&#x7684;<strong>blockdata</strong>&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;iterator&#x5BF9;&#x8C61;&#xFF0C;&#x8C03;&#x7528;&#x8005;&#x5C31;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x8FD9;&#x4E2A;iterator&#x5BF9;&#x8C61;&#x904D;&#x5386;blockdata&#x5B58;&#x50A8;&#x7684;k/v&#x5BF9;&#xFF0C;&#x8FD9;&#x5176;&#x4E2D;&#x7528;&#x5230;&#x4E86;<strong>LRUCache</strong>&#x3002;
&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x903B;&#x8F91;&#x5982;&#x4E0B;&#xFF1A;</p>
<h5 id="s1-&#x4ECE;&#x53C2;&#x6570;&#x4E2D;&#x89E3;&#x6790;&#x51FA;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x5176;&#x4E2D;arg&#x5C31;&#x662F;table&#x5BF9;&#x8C61;&#xFF0C;indexvalue&#x5B58;&#x50A8;&#x7684;&#x662F;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x8BFB;&#x53D6;block&#x7684;&#x7D22;&#x5F15;&#x3002;"><a name="s1-&#x4ECE;&#x53C2;&#x6570;&#x4E2D;&#x89E3;&#x6790;&#x51FA;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x5176;&#x4E2D;arg&#x5C31;&#x662F;table&#x5BF9;&#x8C61;&#xFF0C;indexvalue&#x5B58;&#x50A8;&#x7684;&#x662F;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x8BFB;&#x53D6;block&#x7684;&#x7D22;&#x5F15;&#x3002;" class="anchor-navigation-ex-anchor" href="#s1-&#x4ECE;&#x53C2;&#x6570;&#x4E2D;&#x89E3;&#x6790;&#x51FA;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x5176;&#x4E2D;arg&#x5C31;&#x662F;table&#x5BF9;&#x8C61;&#xFF0C;indexvalue&#x5B58;&#x50A8;&#x7684;&#x662F;blockhandle&#x5BF9;&#x8C61;&#xFF0C;&#x8BFB;&#x53D6;block&#x7684;&#x7D22;&#x5F15;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S1 &#x4ECE;&#x53C2;&#x6570;&#x4E2D;&#x89E3;&#x6790;&#x51FA;BlockHandle&#x5BF9;&#x8C61;&#xFF0C;&#x5176;&#x4E2D;arg&#x5C31;&#x662F;Table&#x5BF9;&#x8C61;&#xFF0C;index_value&#x5B58;&#x50A8;&#x7684;&#x662F;BlockHandle&#x5BF9;&#x8C61;&#xFF0C;&#x8BFB;&#x53D6;Block&#x7684;&#x7D22;&#x5F15;&#x3002;</h5>
<pre class="language-"><code>Table* table =reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Table*</span><span class="token punctuation">&gt;</span></span>(arg);  
Block* block = NULL;  
Cache::Handle* cache_handle =NULL;  
BlockHandle handle;  
Slice input = index_value;  
Status s =handle.DecodeFrom(&amp;input);
</code></pre><h5 id="s2-&#x6839;&#x636E;block-handle&#xFF0C;&#x9996;&#x5148;&#x5C1D;&#x8BD5;&#x4ECE;cache&#x4E2D;&#x76F4;&#x63A5;&#x53D6;&#x51FA;block&#xFF0C;&#x4E0D;&#x5728;cache&#x4E2D;&#x5219;&#x8C03;&#x7528;readblock&#x4ECE;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#xFF0C;&#x8BFB;&#x53D6;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x6839;&#x636E;option&#x5C1D;&#x8BD5;&#x5C06;block&#x52A0;&#x5165;&#x5230;lru-cache&#x4E2D;&#x3002;&#x5E76;&#x5728;insert&#x7684;&#x65F6;&#x5019;&#x6CE8;&#x518C;&#x4E86;&#x91CA;&#x653E;&#x51FD;&#x6570;deletecachedblock&#x3002;"><a name="s2-&#x6839;&#x636E;block-handle&#xFF0C;&#x9996;&#x5148;&#x5C1D;&#x8BD5;&#x4ECE;cache&#x4E2D;&#x76F4;&#x63A5;&#x53D6;&#x51FA;block&#xFF0C;&#x4E0D;&#x5728;cache&#x4E2D;&#x5219;&#x8C03;&#x7528;readblock&#x4ECE;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#xFF0C;&#x8BFB;&#x53D6;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x6839;&#x636E;option&#x5C1D;&#x8BD5;&#x5C06;block&#x52A0;&#x5165;&#x5230;lru-cache&#x4E2D;&#x3002;&#x5E76;&#x5728;insert&#x7684;&#x65F6;&#x5019;&#x6CE8;&#x518C;&#x4E86;&#x91CA;&#x653E;&#x51FD;&#x6570;deletecachedblock&#x3002;" class="anchor-navigation-ex-anchor" href="#s2-&#x6839;&#x636E;block-handle&#xFF0C;&#x9996;&#x5148;&#x5C1D;&#x8BD5;&#x4ECE;cache&#x4E2D;&#x76F4;&#x63A5;&#x53D6;&#x51FA;block&#xFF0C;&#x4E0D;&#x5728;cache&#x4E2D;&#x5219;&#x8C03;&#x7528;readblock&#x4ECE;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#xFF0C;&#x8BFB;&#x53D6;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x6839;&#x636E;option&#x5C1D;&#x8BD5;&#x5C06;block&#x52A0;&#x5165;&#x5230;lru-cache&#x4E2D;&#x3002;&#x5E76;&#x5728;insert&#x7684;&#x65F6;&#x5019;&#x6CE8;&#x518C;&#x4E86;&#x91CA;&#x653E;&#x51FD;&#x6570;deletecachedblock&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S2 &#x6839;&#x636E;block handle&#xFF0C;&#x9996;&#x5148;&#x5C1D;&#x8BD5;&#x4ECE;cache&#x4E2D;&#x76F4;&#x63A5;&#x53D6;&#x51FA;block&#xFF0C;&#x4E0D;&#x5728;cache&#x4E2D;&#x5219;&#x8C03;&#x7528;ReadBlock&#x4ECE;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#xFF0C;&#x8BFB;&#x53D6;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x6839;&#x636E;option&#x5C1D;&#x8BD5;&#x5C06;block&#x52A0;&#x5165;&#x5230;LRU cache&#x4E2D;&#x3002;&#x5E76;&#x5728;Insert&#x7684;&#x65F6;&#x5019;&#x6CE8;&#x518C;&#x4E86;&#x91CA;&#x653E;&#x51FD;&#x6570;DeleteCachedBlock&#x3002;</h5>
<pre class="language-"><code>Cache* block_cache =table-&gt;rep_-&gt;options.block_cache;  
BlockContents contents;  
if (block_cache != NULL)
{  
     char cache_key_buffer[16]; 
     // cache key&#x7684;&#x683C;&#x5F0F;&#x4E3A;table.cache_id + offset  
     EncodeFixed64(cache_key_buffer, table-&gt;rep_-&gt;cache_id);  
     EncodeFixed64(cache_key_buffer+8, handle.offset());  
     Slice key(cache_key_buffer,sizeof(cache_key_buffer));  
     cache_handle =block_cache-&gt;Lookup(key); // &#x5C1D;&#x8BD5;&#x4ECE;LRU cache&#x4E2D;&#x67E5;&#x627E;  
     if (cache_handle != NULL)
     { 
          // &#x627E;&#x5230;&#x5219;&#x76F4;&#x63A5;&#x53D6;&#x503C;  
          block =reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Block*</span><span class="token punctuation">&gt;</span></span>(block_cache-&gt;Value(cache_handle));  
     } 
     else 
     { 
          // &#x5426;&#x5219;&#x76F4;&#x63A5;&#x4ECE;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;  
          s =ReadBlock(table-&gt;rep_-&gt;file, 
                       options, handle, &amp;contents);  
          if (s.ok()) 
          {  
               block = new Block(contents);  
               if (contents.cachable&amp;&amp; options.fill_cache) 
               // &#x5C1D;&#x8BD5;&#x52A0;&#x5230;cache&#x4E2D;  
              cache_handle =block_cache-&gt;Insert(key, block,block-&gt;size(), &amp;DeleteCachedBlock);  
         }  
     }  
} 
else
{  
     s =ReadBlock(table-&gt;rep_-&gt;file, options, handle, &amp;contents);  
     if (s.ok()) block = newBlock(contents);  
}
</code></pre><h5 id="s3-&#x5982;&#x679C;&#x8BFB;&#x53D6;&#x5230;&#x4E86;block&#xFF0C;&#x8C03;&#x7528;blocknewiterator&#x63A5;&#x53E3;&#x521B;&#x5EFA;iterator&#xFF0C;&#x5982;&#x679C;cache-handle&#x4E3A;null&#xFF0C;&#x5219;&#x6CE8;&#x518C;deleteblock&#xFF0C;&#x5426;&#x5219;&#x6CE8;&#x518C;releaseblock&#xFF0C;&#x4E8B;&#x540E;&#x6E05;&#x7406;&#x3002;"><a name="s3-&#x5982;&#x679C;&#x8BFB;&#x53D6;&#x5230;&#x4E86;block&#xFF0C;&#x8C03;&#x7528;blocknewiterator&#x63A5;&#x53E3;&#x521B;&#x5EFA;iterator&#xFF0C;&#x5982;&#x679C;cache-handle&#x4E3A;null&#xFF0C;&#x5219;&#x6CE8;&#x518C;deleteblock&#xFF0C;&#x5426;&#x5219;&#x6CE8;&#x518C;releaseblock&#xFF0C;&#x4E8B;&#x540E;&#x6E05;&#x7406;&#x3002;" class="anchor-navigation-ex-anchor" href="#s3-&#x5982;&#x679C;&#x8BFB;&#x53D6;&#x5230;&#x4E86;block&#xFF0C;&#x8C03;&#x7528;blocknewiterator&#x63A5;&#x53E3;&#x521B;&#x5EFA;iterator&#xFF0C;&#x5982;&#x679C;cache-handle&#x4E3A;null&#xFF0C;&#x5219;&#x6CE8;&#x518C;deleteblock&#xFF0C;&#x5426;&#x5219;&#x6CE8;&#x518C;releaseblock&#xFF0C;&#x4E8B;&#x540E;&#x6E05;&#x7406;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S3 &#x5982;&#x679C;&#x8BFB;&#x53D6;&#x5230;&#x4E86;block&#xFF0C;&#x8C03;&#x7528;Block::NewIterator&#x63A5;&#x53E3;&#x521B;&#x5EFA;Iterator&#xFF0C;&#x5982;&#x679C;cache handle&#x4E3A;NULL&#xFF0C;&#x5219;&#x6CE8;&#x518C;DeleteBlock&#xFF0C;&#x5426;&#x5219;&#x6CE8;&#x518C;ReleaseBlock&#xFF0C;&#x4E8B;&#x540E;&#x6E05;&#x7406;&#x3002;</h5>
<pre class="language-"><code>Iterator* iter;  
if (block != NULL)
{  
    iter =block-&gt;NewIterator(table-&gt;rep_-&gt;options.comparator);  
    if (cache_handle == NULL)  iter-&gt;RegisterCleanup(&amp;DeleteBlock,block, NULL);  
    else iter-&gt;RegisterCleanup(&amp;ReleaseBlock,block_cache, cache_handle);  
} 
else iter = NewErrorIterator(s);
</code></pre><p>&#x5904;&#x7406;&#x7ED3;&#x675F;&#xFF0C;&#x6700;&#x540E;<strong>&#x8FD4;&#x56DE;iter</strong>&#x3002;&#x8FD9;&#x91CC;&#x7B80;&#x5355;&#x5217;&#x4E0B;&#x8FD9;&#x51E0;&#x4E2A;<strong>&#x9759;&#x6001;&#x51FD;&#x6570;</strong>&#xFF0C;&#x90FD;&#x5F88;&#x7B80;&#x5355;&#xFF1A;</p>
<pre class="language-"><code>static void DeleteBlock(void* arg, void* ignored) 
{ 
     deletereinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Block*</span><span class="token punctuation">&gt;</span></span>(arg);
} 

static void DeleteCachedBlock(const Slice&amp; key, void* value)   
{  
      Block* block =reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Block*</span><span class="token punctuation">&gt;</span></span>(value);  
      delete block;  
} 

static void ReleaseBlock(void* arg, void* h) 
{  
      Cache* cache =reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Cache*</span><span class="token punctuation">&gt;</span></span>(arg);  
      Cache::Handle* handle =reinterpret_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token namespace">Cache:</span>:Handle*</span><span class="token punctuation">&gt;</span></span>(h);  
      cache-&gt;Release(handle);  
}
</code></pre><h3 id="67-&#x5B9A;&#x4F4D;key"><a name="67-&#x5B9A;&#x4F4D;key" class="anchor-navigation-ex-anchor" href="#67-&#x5B9A;&#x4F4D;key"><i class="fa fa-link" aria-hidden="true"></i></a>6.7 &#x5B9A;&#x4F4D;key</h3>
<p>&#x8FD9;&#x91CC;&#x5E76;&#x4E0D;&#x662F;&#x7CBE;&#x786E;&#x7684;&#x5B9A;&#x4F4D;&#xFF0C;&#x800C;&#x662F;&#x5728;Table&#x4E2D;&#x627E;&#x5230;<strong>&#x7B2C;&#x4E00;&#x4E2A;&gt;=&#x6307;&#x5B9A;key&#x7684;k/v&#x5BF9;</strong>&#xFF0C;&#x7136;&#x540E;&#x8FD4;&#x56DE;&#x5176;value&#x5728;sstable&#x6587;&#x4EF6;&#x4E2D;&#x7684;&#x504F;&#x79FB;&#x3002;&#x4E5F;&#x662F;Table&#x7C7B;&#x7684;&#x4E00;&#x4E2A;&#x63A5;&#x53E3;&#xFF1A;</p>
<pre class="language-"><code>uint64_t ApproximateOffsetOf(const Slice&amp; key) const;
</code></pre><p>&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF1A;</p>
<h5 id="s1-&#x8C03;&#x7528;blockiter&#x7684;seek&#x51FD;&#x6570;&#x5B9A;&#x4F4D;"><a name="s1-&#x8C03;&#x7528;blockiter&#x7684;seek&#x51FD;&#x6570;&#x5B9A;&#x4F4D;" class="anchor-navigation-ex-anchor" href="#s1-&#x8C03;&#x7528;blockiter&#x7684;seek&#x51FD;&#x6570;&#x5B9A;&#x4F4D;"><i class="fa fa-link" aria-hidden="true"></i></a>S1 &#x8C03;&#x7528;Block::Iter&#x7684;Seek&#x51FD;&#x6570;&#x5B9A;&#x4F4D;</h5>
<pre class="language-"><code>Iterator* index_iter=rep_-&gt;index_block-&gt;NewIterator(rep_-&gt;options.comparator);  
index_iter-&gt;Seek(key);  
uint64_t result;
</code></pre><h5 id="s2-&#x5982;&#x679C;indexiter&#x662F;&#x5408;&#x6CD5;&#x7684;&#x503C;&#xFF0C;&#x5E76;&#x4E14;decode&#x6210;&#x529F;&#xFF0C;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;offset&#x3002;"><a name="s2-&#x5982;&#x679C;indexiter&#x662F;&#x5408;&#x6CD5;&#x7684;&#x503C;&#xFF0C;&#x5E76;&#x4E14;decode&#x6210;&#x529F;&#xFF0C;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;offset&#x3002;" class="anchor-navigation-ex-anchor" href="#s2-&#x5982;&#x679C;indexiter&#x662F;&#x5408;&#x6CD5;&#x7684;&#x503C;&#xFF0C;&#x5E76;&#x4E14;decode&#x6210;&#x529F;&#xFF0C;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;offset&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S2 &#x5982;&#x679C;index_iter&#x662F;&#x5408;&#x6CD5;&#x7684;&#x503C;&#xFF0C;&#x5E76;&#x4E14;Decode&#x6210;&#x529F;&#xFF0C;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;offset&#x3002;</h5>
<pre class="language-"><code>BlockHandle handle;  
handle.DecodeFrom(&amp;index_iter-&gt;value());  
result = handle.offset();
</code></pre><h5 id="s3-&#x5176;&#x5B83;&#x60C5;&#x51B5;&#xFF0C;&#x8BBE;&#x7F6E;result&#x4E3A;rep-metaindexhandleoffset&#xFF0C;metaindex&#x7684;&#x504F;&#x79FB;&#x5728;&#x6587;&#x4EF6;&#x7ED3;&#x5C3E;&#x9644;&#x8FD1;&#x3002;"><a name="s3-&#x5176;&#x5B83;&#x60C5;&#x51B5;&#xFF0C;&#x8BBE;&#x7F6E;result&#x4E3A;rep-metaindexhandleoffset&#xFF0C;metaindex&#x7684;&#x504F;&#x79FB;&#x5728;&#x6587;&#x4EF6;&#x7ED3;&#x5C3E;&#x9644;&#x8FD1;&#x3002;" class="anchor-navigation-ex-anchor" href="#s3-&#x5176;&#x5B83;&#x60C5;&#x51B5;&#xFF0C;&#x8BBE;&#x7F6E;result&#x4E3A;rep-metaindexhandleoffset&#xFF0C;metaindex&#x7684;&#x504F;&#x79FB;&#x5728;&#x6587;&#x4EF6;&#x7ED3;&#x5C3E;&#x9644;&#x8FD1;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S3 &#x5176;&#x5B83;&#x60C5;&#x51B5;&#xFF0C;&#x8BBE;&#x7F6E;result&#x4E3A;rep_-&gt;metaindex_handle.offset()&#xFF0C;metaindex&#x7684;&#x504F;&#x79FB;&#x5728;&#x6587;&#x4EF6;&#x7ED3;&#x5C3E;&#x9644;&#x8FD1;&#x3002;</h5>
<h3 id="68-&#x83B7;&#x53D6;key&#x2014;internalget"><a name="68-&#x83B7;&#x53D6;key&#x2014;internalget" class="anchor-navigation-ex-anchor" href="#68-&#x83B7;&#x53D6;key&#x2014;internalget"><i class="fa fa-link" aria-hidden="true"></i></a>6.8 &#x83B7;&#x53D6;Key&#x2014;InternalGet()</h3>
<p><strong>InternalGet</strong>&#xFF0C;&#x8FD9;&#x662F;&#x4E3A;TableCache&#x5F00;&#x7684;&#x4E00;&#x4E2A;&#x53E3;&#x5B50;&#x3002;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;<strong>private&#x51FD;&#x6570;</strong>&#xFF0C;&#x58F0;&#x660E;&#x4E3A;&#xFF1A;</p>
<pre class="language-"><code>Status Table::InternalGet(const ReadOptions&amp; options, constSlice&amp; k,
                          void*arg, void (*saver)(void*, const Slice&amp;, const Slice&amp;))
</code></pre><p>&#x5176;&#x4E2D;&#x53C8;&#x6709;&#x51FD;&#x6570;&#x6307;&#x9488;&#xFF0C;&#x5728;&#x627E;&#x5230;&#x6570;&#x636E;&#x540E;&#xFF0C;&#x5C31;&#x8C03;&#x7528;&#x4F20;&#x5165;&#x7684;<strong>&#x51FD;&#x6570;&#x6307;&#x9488;save</strong>r&#x6267;&#x884C;&#x8C03;&#x7528;&#x8005;&#x7684;&#x81EA;&#x5B9A;&#x4E49;&#x5904;&#x7406;&#x903B;&#x8F91;&#xFF0C;&#x5E76;&#x4E14;<strong>TableCache</strong>&#x53EF;&#x80FD;&#x4F1A;&#x505A;&#x7F13;&#x5B58;&#x3002;
&#x51FD;&#x6570;&#x903B;&#x8F91;&#x5982;&#x4E0B;&#xFF1A;</p>
<h5 id="s1-&#x9996;&#x5148;&#x6839;&#x636E;&#x4F20;&#x5165;&#x7684;key&#x5B9A;&#x4F4D;&#x6570;&#x636E;&#xFF0C;&#x8FD9;&#x9700;&#x8981;indexblock&#x7684;iterator&#x3002;"><a name="s1-&#x9996;&#x5148;&#x6839;&#x636E;&#x4F20;&#x5165;&#x7684;key&#x5B9A;&#x4F4D;&#x6570;&#x636E;&#xFF0C;&#x8FD9;&#x9700;&#x8981;indexblock&#x7684;iterator&#x3002;" class="anchor-navigation-ex-anchor" href="#s1-&#x9996;&#x5148;&#x6839;&#x636E;&#x4F20;&#x5165;&#x7684;key&#x5B9A;&#x4F4D;&#x6570;&#x636E;&#xFF0C;&#x8FD9;&#x9700;&#x8981;indexblock&#x7684;iterator&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S1 &#x9996;&#x5148;&#x6839;&#x636E;&#x4F20;&#x5165;&#x7684;key&#x5B9A;&#x4F4D;&#x6570;&#x636E;&#xFF0C;&#x8FD9;&#x9700;&#x8981;indexblock&#x7684;Iterator&#x3002;</h5>
<pre class="language-"><code>Iterator* iiter =rep_-&gt;index_block-&gt;NewIterator(rep_-&gt;options.comparator);  
iiter-&gt;Seek(k);
</code></pre><h5 id="s2-&#x5982;&#x679C;key&#x662F;&#x5408;&#x6CD5;&#x7684;&#xFF0C;&#x53D6;&#x51FA;&#x5176;filter&#x6307;&#x9488;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x4E86;filter&#xFF0C;&#x5219;&#x68C0;&#x67E5;key&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x5224;&#x65AD;&#xFF0C;&#x63D0;&#x5347;&#x6548;&#x7387;&#x3002;"><a name="s2-&#x5982;&#x679C;key&#x662F;&#x5408;&#x6CD5;&#x7684;&#xFF0C;&#x53D6;&#x51FA;&#x5176;filter&#x6307;&#x9488;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x4E86;filter&#xFF0C;&#x5219;&#x68C0;&#x67E5;key&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x5224;&#x65AD;&#xFF0C;&#x63D0;&#x5347;&#x6548;&#x7387;&#x3002;" class="anchor-navigation-ex-anchor" href="#s2-&#x5982;&#x679C;key&#x662F;&#x5408;&#x6CD5;&#x7684;&#xFF0C;&#x53D6;&#x51FA;&#x5176;filter&#x6307;&#x9488;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x4E86;filter&#xFF0C;&#x5219;&#x68C0;&#x67E5;key&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x5224;&#x65AD;&#xFF0C;&#x63D0;&#x5347;&#x6548;&#x7387;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S2 &#x5982;&#x679C;key&#x662F;&#x5408;&#x6CD5;&#x7684;&#xFF0C;&#x53D6;&#x51FA;&#x5176;filter&#x6307;&#x9488;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x4E86;filter&#xFF0C;&#x5219;&#x68C0;&#x67E5;key&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF0C;&#x8FD9;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x5224;&#x65AD;&#xFF0C;&#x63D0;&#x5347;&#x6548;&#x7387;&#x3002;</h5>
<pre class="language-"><code>Status s;  
Slice handle_value =iiter-&gt;value();  
FilterBlockReader* filter = rep_-&gt;filter;  
BlockHandle handle;  
if (filter != NULL &amp;&amp; handle.DecodeFrom(&amp;handle_value).ok() &amp;&amp; !filter-&gt;KeyMayMatch(handle.offset(),k)) 
{ 
    // key&#x4E0D;&#x5B58;&#x5728;  
} 
else
{
    // &#x5426;&#x5219;&#x5C31;&#x8981;&#x8BFB;&#x53D6;block&#xFF0C;&#x5E76;&#x67E5;&#x627E;&#x5176;k/v&#x5BF9;  
    Slice handle = iiter-&gt;value();  
    Iterator* block_iter =BlockReader(this, options, iiter-&gt;value());  
    block_iter-&gt;Seek(k);  
    if (block_iter-&gt;Valid())(*saver)(arg, block_iter-&gt;key(), block_iter-&gt;value());  
    s = block_iter-&gt;status();  
    delete block_iter;  
}
</code></pre><h5 id="s3-&#x6700;&#x540E;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#xFF0C;&#x5220;&#x9664;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x3002;"><a name="s3-&#x6700;&#x540E;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#xFF0C;&#x5220;&#x9664;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x3002;" class="anchor-navigation-ex-anchor" href="#s3-&#x6700;&#x540E;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#xFF0C;&#x5220;&#x9664;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x3002;"><i class="fa fa-link" aria-hidden="true"></i></a>S3 &#x6700;&#x540E;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#xFF0C;&#x5220;&#x9664;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x3002;</h5>
<pre class="language-"><code>if (s.ok()) s =iiter-&gt;status();  
delete iiter;  
return s;
</code></pre><p>&#x968F;&#x7740;&#x6709;&#x5173;<strong>sstable&#x6587;&#x4EF6;&#x8BFB;&#x53D6;</strong>&#x7684;&#x7ED3;&#x675F;&#xFF0C;sstable&#x7684;&#x6E90;&#x7801;&#x4E5F;&#x5C31;&#x5206;&#x6790;&#x5B8C;&#x4E86;&#xFF0C;&#x5176;&#x4E2D;&#x6211;&#x4EEC;&#x8FD8;&#x9057;&#x6F0F;&#x4E86;&#x4E00;&#x4E9B;&#x529F;&#x8BFE;&#x8981;&#x505A;&#xFF0C;&#x90A3;&#x5C31;&#x662F;<strong>Filter&#x548C;TableCache</strong>&#x90E8;&#x5206;&#x3002;</p>
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